Production method of layered crystal material

Abstract

An ammonium metavanadate is heat-treated to 500° C. or less at a predetermined rate of temperature rise, whereby a microcrystal particle of a vanadium pentoxide can be formed. According to the production method described above, a crystal of a nano-vanadium having a layer length of 100 nm or less can be formed. The nano-vanadium formed by the production method described above can effectively be used for an electrode of an electric storage device such as a battery. The production method according to the present invention can be linked to a conventional production method in which an ammonium metavanadate can be formed in the course of the method, whereby the present invention can smoothly be embodied.

1 . A production method of a layered crystal material of a microcrystal of a vanadium oxide having a layer length of 100 nm, the method comprising:
 a nano-crystallizing process for growing a crystal so as to have a layer length of 100 nm or less, wherein   the nano-crystallizing process includes a heat-treatment process for heating a salt of vanadic acid at a temperature equal to or less than a predetermined temperature.   
     
     
         2 . The production method of a layered crystal material according to  claim 1 , wherein the nano-crystallizing process includes a process for heat-treating an ammonium metavanadate at 500° C. or less. 
     
     
         3 . The production method of a layered crystal material according to  claim 2 , wherein the ammonium metavanadate is heat-treated at 150° C. or more. 
     
     
         4 . The production method of a layered crystal material according to  claim 2 , wherein the ammonium metavanadate is formed by a salting-out from a soluble salt of vanadic acid. 
     
     
         5 . The production method of a layered crystal material according to  claim 4 , wherein the soluble salt of vanadic acid is a salt of an alkali metal. 
     
     
         6 . The production method of a layered crystal material according to  claim 5 , wherein the soluble salt of vanadic acid is a sodium salt. 
     
     
         7 . The production method of a layered crystal material according to  claim 4 , wherein the soluble salt of vanadic acid is formed with a combustion ash being used as a material. 
     
     
         8 . The production method of a layered crystal material according to  claim 1 , wherein the microcrystal having a layer length of 100 nm or less but not including 0 is used for an electrode of an electric storage device. 
     
     
         9 . The production method of a layered crystal material according to  claim 8 , wherein the electric storage device is a lithium ion secondary battery.